<!DOCTYPE html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <style>
        h1{
            text-align: center;
            color:#fff;
            line-height:100vh;
        }

        body{
            background: #000000;
            padding:0;
            margin:0;
        }
    </style>
</head>
<body>
    <h1>
        页面不存在
    </h1>
</body>
</html>